Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1bfc4179060977…

MALICIOUS

PDF

36.2 KB Created: 2020-08-16 13:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59a7f9745bc12c092a1f653f437e3d3 SHA-1: 397d581c53a92fd9ce1b6dbca4ae2bc350948ba0 SHA-256: 6f1bfc4179060977b6b2899fd485903d623dd783dc6c55fa6117b99f43d1ac7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'clicker programming guide' and includes the malicious URL. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. No scripts were extracted, but the embedded links are sufficient to indicate a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=clicker+programing+guide
    • http://files.milbur.org/uploads/1/3/1/8/131857758/zasiwugijeb-gefodirosut.pdf
    • http://wugad.michaeletherington.com/uploads/1/3/1/4/131408614/790e446.pdf
    • http://zubokofar.whitlowelementary.com/uploads/1/3/1/0/131070420/2424779.pdf
    • http://fakoxujov.flchavre.org/uploads/1/3/0/8/130874493/d5405c7e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/xorunugut.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/largest_real_estate_crowdfunding_platforms_in_europe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/74948386212.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/tuwili.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/66405135533.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/84513060822.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2327/files/recursos_didacticos_audiovisuales.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/vumesererejelatitepapim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0580/files/mevemagopeke.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/pilanusonilugo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/98259887892.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/wonipowod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e9f.bin
dcd4a0b293419101e7102d5c5f47e2eef3845efcad04ce3a2df321eb7adee634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9F 5184 bytes
font_01_sfnt_off00006022.bin
43a2918c77a3560c2d3f80f6efb4357ac49a46c57bb65aa12f60323cd50ae1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6022 10560 bytes

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